Valveless lubricating-oil-pumping apparatus



July 23, 1929. FRlEDMANN 1,722,136

VALVELESS LUBRICATING OIL PUMPING APPARATUS Filed May 3, 1922 Patented July 23, 1929.

UNITED STATES LOUIS FRIEDMANN, OF VIENNA, AUSTRIA.

VALVELESS LUBRICATING-OIL-PUMPING APPARATUS.

Application filed May 3, 1922. Serial No. 558,244,

This invention relates to valveless lubricating oil apparatus wherein there is no separate distributing piston, and wherein the pumping piston by itself controls the admission of the oil into the cylinder space and also the delivery of the oil into the delivery duct.

This control is produced by giving not only a to-and-fro motion but also and simulta neously therewith a rocking motion around its longitudinal axis.

The working of a pumping apparatus of this kind is improved to a far greater degree than has hitherto been the case and this is achieved'by the following means.

The pumping cylinder is provided with two mutually facing exit apertures both opening into the delivery duct, the pumping piston is formed at its periphery with vone or two apertures opening in the bottom end of the said piston. At the same time the piston is provided at that end which projects from the piston cylinder with a cross-head having a longitudinal slot.

The member which produces the rocking motion of the piston is located eccentrically in the said slot and is adapted to move longitudinally therein. Further, there is provided a spring which has a tendency to push the piston out of the cylinder. The movement of the piston in its outward stroke from the cylinder is limited by an adjustable stop connected to the oil vessel.

The improvements of this invention are illustrated in the accompanying drawings, in which Figures 1 and 2 are respectively a vertical section and a horizontal section of the improved lubricating apparatus.

Figure 3 is a longitudinal section of a piston and cylinder.

Figure 4 is a cross-section of the said piston and cylinder during the outer stroke.

Figure 5 is a cross-section of the said piston and cylinder during the suction stroke.

Figures 6, 7 and 8 are sectional views similar to Figs. 3, 4 and 5, showing a modification of the piston wherein the oil is able to pass between the piston and the wall of the cylinder to the inside of the piston, the outer part of the piston being correspondingly recessed to allow of this taking place.

As shown in Figures 1 and 2, 1 is the oil vessel containing the oil pumping cylinders 2 in which work the pistons 3. Each piston has connected to its outer end a cross-head 4 which is formed with a recess 5. This recess 5 is of a width such that the arm or pin 6 will just fit conveniently in it. The length of the recess in the direction of the axis of the piston is however such as to allow the piston to move relatively to the arm 6. This arm is of such through the medium of the rod 8. The entire arrangement including the abutment 10 is 10- cated below the lid in the oil vessel.

The pumping cylinder is formed as shown in Figures 4, 5, 7 and 8 with an oil admission duct 11 and with two oppositely facing apertures 12 and 13, each of which is connected with the delivery duct 14 by way of a duct provided in the wall of the cylinder casing, so that the back pressure in the duct 14 exists also and to the same degree in both apertures 12 and 13. Consequently when pressure exists in the duct 14 the piston situated in the cylinder will be subject to pressure on both sides and therefor uneven lateral pressure on the piston and tendency of the latter to bind will be avoided. The piston itself is formed with a T-shaped port 15 one end of which communicates with'the bottom of the cylinder and the other end of which communicates with grooves 15 and 15 provided in the outer surface of the piston.

As a modification however, shown in Figures 6,7 and 8, there may be .formed in the periphery of the piston 2 grooves 15, 15", which are open towards the bottom end of this piston; These grooves have the function when the piston is raised of establishing connection between the cylinder and the oil admission aperture 11, and during the delivery stroke of the piston to establish connection between the cylinder and the two oil exit apertures 12 and 13.

If desired, only one aperture may be pro vided in the periphery of the piston in which case during the pressure stroke of the piston the oil will pass into the delivery duct 14 only through one of the exit apertures, namely, either through the aperture 12 or through the aperture 13. In this case the piston will be relieved completely of pressure only during its suction stroke whereas When this shaft 16 rotates, the shaft 17 is moved axially and simultaneously therewith ing two opposite ports for the exit of the receives also a rocking motion around its axis so that the arms 6 describe a closed curve. By means of this motion the pistons likewise receive a reciprocating motion and simultaneously therewith also a rotary motion around their longitudinal axes. stroke of each piston in its own 0 linder is produced by means of the arm 6 w ereasthe out-stroke of each piston out of its cylinder is produced by the spring 7 and this latter movement will continue until the piston is prevented from-such further movement by the stop 10. The stroke of each piston can be regulated by adjusting the respective adjusting screw 10 whereas the rocking motion remains unchanged.

What I claim is 1. In a force feed lubricator, a cylinder and a piston therein, unitary means to impart simultaneously a reciprocating and a rocking movement around the longitudinal axis to said piston, a delivery duct for delivering the lubricant under pressure, said cylinder 'havlubricant, channels leading from said opposite delivery ports to the delivery duct arranged so as to transmit the pressure from the delivery duct to opposite faces of the piston and to relieve it from pressure.

2. In a pumping device including a suction supply and a discharge passage, a piston, a

cylinder, means for connecting said passages at the proper time with the cylinder space beneath the piston, a driving mechanism comprising a. spring acting upon said piston and having the tendency to move said piston out of the cylinder in the direction of the axis of the cylinder, and a finger moved in a closed curve, a piston head provided with a recess to receive said moving finger, said recess being so formed asto allow free move The inf ment of said -finger ina direction parallel to theaxis of the piston when the spring is free to actuate the piston, but otherwise enclosing said finger so asto be compelled to follow its movement positively, thus deriving a positive oscillating movement and a positive pressure stroke from one and the same drivingat the proper time with the cylinder space beneath the piston, a driving mechanism comprising a spring acting uponsaid piston to produce a suction stroke of the piston and a finger moved in a closed curve, a piston head provided with a recess to receive said moving finger, said recess being so formed as to allow ree movement of said finger in a direction parallel to the axis of the piston when the spring is free to actuate said piston, but otherwlse enclosing said finger-so as to be compelled to follow its movement positively, thus deriving a positive oscillating movement and a'posit-ive pressure stroke from one and the same driving mechanism, and an adjustable regulating member capable of limiting the stroke of the piston at the end of its suction movement.

4. In combination, a reciprocable member,

dual actuating means for the reciprocable member, one of said dual means including a reciprocating member having a fixed travel and acting to produce a stroke of the reciprocable member in one direction only for the discharge stroke, and spring means adapted to be compressed by the reciprocating member for producing movement of the reciproeating member in the opposite direct-ion, and an adjustable member arranged to limit the movement of the reciprocable member under theinfluence of of the spring means for limiting the extent of movement of the reciprocable member and for variably fixing the point at which the reciprocating member becomes eifective to produce movement of the reciprocable member, said actuating means imparting rotary motion to the piston during movement of the latter under the influence of the spring means.

In testimony whereof I have signed my name to this specification. 

